Hydraulic-pressure generating and controlling device.



J. W. NELSON.

HYDRAULIC PRESSURE GENERATING AND CONTROLLING DEVICE.

APPLICATION mum FEB. 1a, 1908.

914,163. Patented Mar. 2, 1909.

2 SHEETS-SHEET 1.

WITNESSES:

IIVVEIIIITOI? 1n: umams PETERS co., wasumomu, n, c.

B) %;c ATTORNEY 3 J, W. NELSON.-

HYDRAULIG PRESSURE GENERATING AND CONTROLLING DEVICE.

APPLICATION FILED FEB. 13. 190B.

91 4, 1 63. Patented Mar. 2, 1909.

2 SHEETS-SHIJET 2.

v INVENTO fmmmm.

ATTORNEYS THE NORRIS PETERS cm, WASHINGTON, n c.

JAMES W. NELSON, OF NEW YORK, N. Y.

HYDRAULIC-PRESSURE G-ENERATENG AND CONTBOLLIN G DEVICE.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed February 13, 1908. Serial No. 415,785.

T all whom it may concern:

Be it known that I, JAMEs W. NELsoN, a citizen of the United States, and a resident of the city of h ew York, borough of Brooklyn, county of Kings, and State of New York, rave invented certain new and useful improvements in Hydraulic-Pressure Generating and Qontrollino; Devices, of which the following is a specification.

This invention relates to devices for generating and applying hydraulic pressure, and has particular reference to devices of this class for use in locations and under conditions which make it necessary to frequently move and readjust parts of the device in order that the pressure generated may readily be successively applied at different points.

in a co-pendingapplication filed by me October 29, 1907, Serial Number 392,740,

l have shown and described a hydraulic pump and pressure controlling device in which a pump, of the single-piston type, is sepa ate from the pressure-applying means or rain, the application of the pressure being controlled or governed at the ram.

The present invention contemplates corresponding means for controlling the operations of separate pressuregeneratiiig means,

in this case said means comprising two or more pumps or a pump of the multiple-piston type.

My invention will be more readily understood by reference to the accompanying drawings, fori'ning a part of this specification, in which Figure 1 is a side elevation of both members of a complete device embodying my invention; Fig. 2 is a transverse central section of the ram member and the pressure-controlling means which forms a part thereof, and Fig. 3 is a transverse central section of the pump member showing the arrangement of the pistons and passages communicating therewith.

Referring now to the drawings in detail numeral 7 refers to a suitable base plate or supporting member, carrying, )referably integral therewith, the cylindrica pump-blocl S. The pump-block S is provided with a central pump-bore which com ,rises an upper portion 9 of relatively larger diameter and a lower por ion 10 of relatively smaller diameter. The upper end of the cylinder 8 is exteriorly threaded to receive the interiorly threaded ring 11 carrying the yoke 12 which provides a guide for the upper end of the piston-rod 13. Within the ring 11, the upper end of the cylinder 8 is provided with a screw threaded pocket to receive the packing-ring 14 which is firmly pressed therein and against the rod 13 by means of the correspondingly threaded cap 15. The pump blockS is further provided with a bracket 16 in which is pivoted the link 17 which provides an adjustable fulcrum for the pump-lever 18. The rod 13 is formed with a flattened bearing portion 19 which is pivoted within the pump lever 18, so that by the operation of said lever the rod 13 may be vertically reciprocated for the purposes hereinafter set forth.

Upon the piston rod 13 is mounted a piston 21 snugly fitting within the upper portion 9 of the pump-bore, while an extension 22 of said piston rod carries the smaller piston 23 snugly fitting within the lower portion 10 of said bore. The pistons are preferably provided with suitable packing, which, since it is a common and well-known expedient and forms no part of the present invention, is not shown in the drawings.

The pressure applying means comprises the usual cylinder 24 the bottom of which is preferably closed by the scrcw-plug or plate 25 having the customary oppositely positioned recesses 26 for employment of a spanner wrench when it is desired to have access to the interior of the cylinder. Within the cylinder 24 is located the vertically-acting ram 27 which is provided with the usual packing 28. Preferably secured to the exterior of the cylinder 24c in any suitable manner, is the valve box or containing member 29 provided with a centrally-located, vertical, valve bore 30 leading downwardly from an enlarged portion or chamber 31 therein. 'his bore 30 is increased in diameter at 32 to provide a seat for a valve 33 having an upwardly projecting stem 34 in said chamber. The diameter of the bore is further increased at 35 to provide a seat for the valve 36 having the stem 37 which, under normal conditions, extends nearly but not quite to the valve 33.

'Within the enlarged portion of the bore below the valve 36, I prefer to insert the valve plug 39 (as shown and described in detail in my co-pending application filed July 8, 1907, Serial No. 382,56 l, and for the purposes set forth t'zierein) whic i'i. provides a seat for the preferably spring-supported valve 40, having an upwardly projecting stem 41 extending under normal conditions nearly but not quite to the valve 36. The lower end of the bore below the valve 40 is sealed by means of a screw plug 42 and forms a chamber 43 from which leads the lateral duct 44 communicating with the chamber 45 beneath the ram 27.

Leading into the chamber 31 above the valve 33, preferably through a connection 46,

is a passage from a preferably flexible pipe or conduit 47, the other end of wltich is conneeted to a tank, barrel or any suitable source of liquid supply (not shown).

Located in the valve-box 29 is a lateral duct 48 leading from the bore 30 at a point below the valve 33 and above the valve 35, which through. the medium of a suitable coupling or connection 49 communicates with the preferably flexible conduit or pipe 50 leading, through a suitable coupling 51 communicating with a lateral duct 52 in the pump block, to the pump-chamber 9 below the piston 21. Similarly leading from that portion of the valve bore 30 below the valve and above the valve 40, is alateral duct 53, communicating through the flexible pipe or conduit 54 and coupling 55 with the lateral duct 56 leading into the chamber 10 below the smaller pump 23. The pipes or conduits 50 and 54 are referably of copper, lead or other soft meta which may have the requisite strength to withstand the heavy ressure strains and yet possess sufficient fiexi ility to permit of decided changes in the relative positions of the pump and ram.

r In the wall of the valve-box opposite the chamber 31, is a screw-threaded aperture adapted to receive the correspondingly exteriorly threaded screw-plug 57 within which is rotatably journaled the stud or short shaft 53 carrying at its inner end, within the chamber 31, a cam 59. The exterior end of the shaft is preferably formed with a slot to provide a seat for the end of the operating lever 60 by means of which the shaft, and therewith the cam, is rotated. The cam is so positioned upon the shaft that under normal conditions the periphery thereof is clear of the end of the stem 34 of valve 33, and therefore non-interferent with the automatic action of the valve.

It will be observed that upon the rotation of the shaft 53, and consequent rotation of the cam 59, the cam surface will impinge against the end of the stem 34 of the valve 33, first operating to positively unseat said valve, and upon the continued rotation of the cam cause the valve 33 to impinge against the upper end of the stem 37 to unseat the valve 35. Still further rotation of the cam 59 will cause the valve 35 to impinge against the stem 41 of and unseat the valve 40 in opposition to its spring support.

It will now be apparent that upon the upstrokeof the piston rod 13, carrying tl1erewith the pistons 21 and 23, partial vacuums will be formed in the pump chambers 9 and 10 below the pistons 21 and 23, which will result in the liquid flowing from the source of supply through the pipe or conduit 47, past the valves 33 and 36, and through the pipes 50 and 54 into the pump chambers. Upon the down-stroke of the pistons 21 and 23, incident to the manipulation of the pump lever 18, the liquid drawn into the pump chambers upon the u -stroke of the pistons will be forced throng the conduits 5-0 and 54 into the chamber 31, past the valves 36 and 40, which are unseated, the valve '33 checking back-flow to the source of supply, through the lateral duct 44 and into the ram chamber 45. In this manner the operations of both pumps are rendered effective for the delivery of a maximum volume of liquid to the ram chamber, for the purposes of rapidity in the generation of preliminary pressure, as, for example, when it is desired to rapidly raise the ram to the point where it receives the full weight of the load. If it is now de sired to sacrifice speed for increased power, under the well known principles of hydrostatics, by rendering the larger pump inoperative, the lever 60 may be turned to rotate the shaft 53 through an are sufficient to unseat the valve 33 in the manner de scribed, without, however, interfering with automatic action of any of the remaining valves. .It will be apparent, under these conditions, that the valve 33 no longer checks back flow from the larger pump to the source of supply, and therefore, the liquid under pressure of said larger pump will follow the path of least resistance, and upon operation of said pump flow idly back and forth between the larger .pump chambers and the source of supply. Under these conditions, the lower and smaller pump alone is effectively operative. It will be furthermore apparent that by turning the lever 50 through a slightly additional arc, the valve 33 will impinge the stem of the valve 35 and unseat the latter, under which conditions there is nothing to check back flow from either of the pump chambers to the source of supply, and, the final pressure valve 40 remaining seated, the liquid from both pumps will flow idly back and forth to and from the source of supply. VJ hen the work has been completed and it is desired to change the location of the ram-member or permanently remove the apparatus, the lever is turned to effect in the manner de scribed the maximum depression of the valve 33 and the consequent unseating of the valves 36 and 40, thereby providing an 0 en passage from the ram chamber 45 to t e source of supply. The weight of the ram itself will under ordinary condition force the liquid out of the ram chamber and back to said source of supply, irrespective of the fact that the pumping operations are continued.

Particular attention is directed to the fact that Where the ram chamber is separate from the pump or pump member, with flexible or other conduits therebetu'een, and the controlling valves are located in the usual manner in the pump member, one or more of the connecting conduits is under continuous and intermittently increasing pressure from the time the punming operation is started until the ivorls is done and the pressure in the ram chamber relieved "Tot only does this vastly increase the pose ity of leakage and more serious consequences '1 case of accident, but it is well l" 731 t at copper pipe or tubing and such tubii Q is most frequently employed for this co nection acquires a certain temper from being thus subjected to pressure, which within a comparatively short period of time destroys its flexi bility and, therefore, its usefulness for this purpose. irith the valve located at what may be termed the ram end of the connection, it will be apparent that the connecting conduit is subjected to the pressure of the liquid only when the pump is in action, not only doing away With a large proportion of the annoyance from accidents and leakage, but reducing by about ninety per cent. (so far as I can determine) time during 2; hieh the pipe or conduit is subjected to pressure, thus prolonging its useful life by 1 )l6\"-3Z1ililg early hardening and rigidity and the necessity for frequent annealing. Furthermore, it ill be apparent that the operator at the ram, who is in position to note the effect and process of the Work, may instantly, and without the necessity of signaling in any manner to the operator at the pump, render one pump inoperative leaving the other alone effective, or render both pumps inoperative irrespective of continuance of the pumping operations and Without relieving the pressure in the ram chamber, or may unseat all valves for the lowering of the ram and the removal or readjustment of the device.

'fue ends of a curved plate 61, secured to or integral with said valve be or container 29, may provide suitable stops to prevent accidental rotation of the shaft 58, the lever 60 being normally in engagement with one or the other of said ends and being preferably pivoted in the end of the shaft 58 Whereby, in order to rotate said shaft, it is necessary to first withdraw said lever clear of said plate and subsequently operate the same to rotate said shaft.

1 have shown the plate 7 of sufficient length to provide a support for the platform 63, against which the end of a suitable brace (not shown) may be placed to resist tendency of thepump member to tilt under action of the pumping forces. l have further shown the ram cylinder provided with folding handles 62 by means of Which this member may be readily moved from place to place.

Any modifications of minor details of my improved hydraulic pressure generating and controlling device will doubtless readily suggest themselves to those skilled in the art to which it appertains, and I therefore do not desire to limit my invention to the specific construction herein shown and described.

1 claim as new and desire to secure by Letters Patent:

1. in combination, a plurality of means for generating hydraulic pressure, means separate therefrom for applying the pres sure, and means forming part of said applying means for controlling the flow to and from saidgei crating means.

2. In com -ation, a plurality of means for generating hydraulic pressure, means separate therefrom for applying the pressure, and means forming part of said applying means for controlling the flow to and from each of said generating means.

3. In combination, a plurality of means for generating hydraulic pressure, means separate therefrom for applying the pressure and means forming a part of said applying means for controlling the flow to and from each of said generating means and for relieving the applied pressure.

in combination, a plurality of stationary means for generating hydraulic pressure, movable nleans for applying the generated pressure at selective points, and means forming part of said applying means for controlling the flow to and from each of said generating means.

5. .ln combination, a plurality of stationary means for generating hydraulic pressure, movable means for applying the generated pressure at selective points, and means form ing part of said applying means for control ling the flow to and from each of said generating means and for relieving the applied pressure.

6. In combination, a plurality of means having common actuating means for generating hydraulic pressure, and means separate therefrom for applying the pressure and for rendering inoperative one or all of said generating means and for relieving the applied pressure.

In combination, a plurality of means having common actuating means for generating hydraulic pressure, and means separate therefrom for applying the pressure and for controlling the flow to and from each of said generating means and for relieving the applied. pressure.

8. In combination, a plurality of means having common actuating means for generating hydraulic pressure, means separate therefrom for applying the pressure, and means forming part of said applying means for controlling the flow to and from each of said gencrating means.

9. In combination, a plurality of means having common actuating means for generating hydraulic pressure, means separate therefrom for applying the pressure and means forming a part of said applying means for controlling the flow to and from each of said generating means and for relieving the applied pressure.

10. In combination, a stationary multiple pump, a movable ram, and means movable with said ram to control flow to and from each pump chamber.

11. In combination, a stationary multiple pump, a movable ram, and means movable with said ram to control flow to and from each pump chamber and the ram chamber.

12. In combination, a stationary member containing a plurality of pumps, and a movable member containing the pump valves and means for applying the pressure generated by said pumps.

13. In combination, a stationary member containing a plurality of pumps and a movable member to apply the pressure generated by said pumps, said movable member containing the pump valves and means for their manual control.

14. In combination, a stationary member containing a plurality of pumps and a movable member to apply the pressure generated by said pumps, said movable member containing the pump valves and being provided with means for unseating one or more of said valves.

15. In combination, a stationary multiple pump, a movable ram-cylinder and ram, a member secured to said ram-cylinder which contains a portion of a fluid passage from source of supply to all pump chambers and to the ram chamber, suitable valves in said passage and in said member, and means for controlling said valves.

16. In combination, a stationary multiple pump, a movable ram-cylinder and ram, a member secured to said ram-cylinder which contains a portion of the fluid-passage from source of supply to theram chamber, valves in said passage and in said member, a duct leading from said passage between each pair of valves to a pump chamber, and means for controlling said valves.

17. In combinatlon, a stationary multiple pump, a movable ram-cylinder and ram, a member secured to said ram cylinder which contains a portion of the fluid-passage from source of supply to each pump chamber, suitablepump and pressure valves in said passage and in said member, a duct leading from said passage below said valves to the ram chamber, and means for positively unseating one of said valves, said means being further operable to unseat all of said valves.

18. In combination, a stationary multiple pump, a movable ram-cylinder and ram, a

member movable with said ram-cylinder which contains a portion of the fluid-passage from source of supply to each pump chamber, suitable valves in said passage in said memher, a duct leading from said passage below said valves to the ram chamber, said member being provided with means for positively unseating one or all of said valves.

JAMES W. NELSON.

Witnesses:

A. E. FARLEY, JAs. MOORE. 

